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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a30dbaa23fa07df85d9da553493013aa17e445d583f40d56d17a0a4260aac6de' 
  AND token = 'YaQMPe7oXTzUUSQrU6C1BieRPeIQyKesr1Iowoy7+bw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00067

JSON explain

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