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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04716ab2ecf4d10446afd5a78cdbc622336c190566dc33c737304f0c046de867' 
  AND token = 'lMFk/K6+gDtSwFRDR0dCDIR4gOt7u1s6N3Hsrd9mGAg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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