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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c2d4507557fd190b6c243ca08af7c23823d237383369f3a3f6255732b6146ba' 
  AND token = 'eEABR2FE2iwB5Zx71ol0d51evdNdGjc/kFQHGlahDY0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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