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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff17aa161c0461d041702b3c9b5c01482ef4db033a0b254d28d56439baab5904' 
  AND token = 'coaCwtspJaAa5AJWApPjf0Mh015i2hPg020mLs1pnGg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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