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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '193efd9e432585c5343f3febc4186e6b5f09f5bbbba63c48ba1eb289cbdd895f' 
  AND token = 'xkZdXWCVEFb6ZBOtUziTo/3/YEXqXl6czp1elbyEzSo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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