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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be6b052ed47d7e98fe6ebfb7899a95778c58ddeba3faae34095ee337e94d6573' 
  AND token = 'JwruaRNJCpBxA7ejP1RK7V+9hDb9dmCh5DABLHJFQrY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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