Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c81a3a927304cdbed3048d12c216f5c8eb17f2bfd50c748dc149c3813d88bc0b' 
  AND token = '0tmiRKTcMFLVyi8g1KFswoyHOqj869MPEU6c80eM9fQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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