SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fb1174ad5831f2fba9b835097bdf81df318e25fa8a6d9c3330a45bc5a69a801' 
  AND token = 'Vo2OfG7YpvMacCyobZ/TsKEeCyijUHOxyBovTW7yaJQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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