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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '334a538aa911a405e9018b8c4948916fd3680b291f5a02965b338d1ad13df077' 
  AND token = 'pl+YELjs2cEwJbOQEq0j+cKTWSv6150HkO5+xohfYQU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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