SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8125d7fd4e6623526091e272fb1841783f52eb92c34b14231e46109fd0ec6862' 
  AND token = 'shgRyPlpOQr0twrSCvZgOCQkK9QDHKS/yl/KY4ugbEw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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