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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19f076656ca07ea5d8b2f76e66a18b832bc83e7a5f75c93a1be614a6fea6ce0d' 
  AND token = 'm9fF+lDTJAac90n21mXX3sChsUDXXeD653seFfG32YU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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