Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7a3c9204e6f7427485025605babbd984a1cc9945bb082f9b366b8a884b7c543' 
  AND token = 'hiXyr0gzf6UsZG2bb3fBSBYdcnuPsKACxfTajZ05fr4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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