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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a223d40fb6a060968d67293c95ccb3762689bb5c9bdd4a08a4c6ba19c7cdaf29' 
  AND token = 'lRpi8u8iK8oKapMZj27wPjT4O0GbNmjauNvrku8Lkv8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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