SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4e86ea61511fc46d77428143d519ff8d515535ec96cc41eb25c023897adf1d4' 
  AND token = 'IC40sDjswBDGHT+tq1Ba78ZPpU3IsSdZ+Htz2v1OShg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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