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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b14dc8abda5682d60095144d3b2d999769fd238c2ac34b76817d37ee2f8f896e' 
  AND token = 'B2o8wbOzEEXb97cflYMFi5T0ozLYreT8UkCzn6001Ug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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