SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fd0c062c4cec842cbd574345437089634894f5ba2fa06c28a391d8956b7a167' 
  AND token = 'M5ZtOUZINX2yNKY/Y2mgXknuKvRSz1YOswM+5dauxtE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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