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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddf231679c17712a35afcfea88ca1010d52ecdbeb59a3781b86ebff47af9ed3e' 
  AND token = 'SZSwgTKj0TyRus7Kzhbs8JVOVJdCaiQI+Zt3D14HohA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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