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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f439a942ecd0a44b2116413f111f96a4e69f09041cf975bc7d97be87d9249f3f' 
  AND token = '6kJT7ynyVVOU4sKQ6lJMgU/ScH5xNxJOZwrq6d9dKZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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