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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e94bb3fce86b83ed4ff9a7d5bf375d76a01c581ffebf511f677fdc4e5d1ff3d' 
  AND token = 'wUbdoOsGjUks4JsWnfwEz5JFmNMqbj8s8Cesb7AQbAg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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