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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97a607b2efed7f32e3263c792051c29b66f94982ef8ce8042ea70caf9128ab8d' 
  AND token = 'XJL9QeLD2s8rG2qZmFlzXBOZds0ALlMhCVPFzwFQBpo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}