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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '303b662c7472e63222f7cb297fd83b333e6cbc613d2f5f64d3ac5633c1085dd3' 
  AND token = 'PMfwZskG3YE8H4N77wS5KY179kq40cNuOuZkz8mlGSg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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