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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '324469ded4179345f6da6317f0ae6abf803e861ef9b891df8e8d00d962b36167' 
  AND token = 'QpR0D8TQrauw4yw5raCdM1wFhgiZN7Zu1Xw0EEmO8Tw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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