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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c744310a2d950d54dd8ce70b481e6c4a572fa1f11a20c33a4aae87bc6c5d19b4' 
  AND token = '3/mt15Yy1NHy2QJBhJsVS3ThdHyZC6/DnSAQFElD3U0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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