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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbc2ec0c60506e94e82df69beb791ff41580c9b24de4f85120b2845423613093' 
  AND token = 'YTTtbDLO1sKrSA2C4gOCyj6RWKKq6qDO+yRc3g9ZDF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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