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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3a89900d2fd9a201198437d3611ecf791b67745df5f7486040e13d6baab3299' 
  AND token = 'CR7Sqn8wpjNB6TijwlV+wxNuxW16RxJj5isd/xaqbsE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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