SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc7158bb988852dfc7471f19962ca6bf943b7f408cef4a38defd454c49fb3384' 
  AND token = 'vWIc86Bv/+DzuXut1sPEDElYz5RyCjZkl+cYwV9ueVc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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