SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13ded5a59b6edaf04c83340757d02c9c795f85e9a9bf8726b38d194840a30792' 
  AND token = 'zq0O6ZgKqSY5jLaujntCml98UgZHMP1z2BZaaAJQv/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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