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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f735b8bea853cf7f88013d340762ee26130544c907838de63e0559a86f9a3555' 
  AND token = 's4FmsXwG92oj1k4jm6245WRmdIGrF+kc9kY/WJBhNyw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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