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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89031e94b56632b2e3e225447495b9dd8c8d4207446c2e97aa58f7fcabe38b45' 
  AND token = 'i+9yU0ZrxzoutPAAthRlEE9QI5aF9iIGE7S1Enfyty8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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