SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '582d91d8cf0b53b9ca075518a7736e1b0ba40d182f4eabc3314830f6d17d9b91' 
  AND token = 'fVOdzTJZi60lbeNAuKYHnpDnwlZLQuQVFvquW/wvw88=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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