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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38935d206cf7cf1d6f42e80efd9e6604f588743ed9f9150456036aec0fc3e7dd' 
  AND token = 'Q+sGuLPzcbA2NFUNpI42Qu3QRTNJl8U0JUaaTD4oxA0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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