SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff70bf73068d455b484c7e4214e7b5388c105d50c011943b076ab9a74c392368' 
  AND token = 'fvtwQ75G4PgiAfzXX4NfWsPLq6Y8YTJf0VaKb+TKuJY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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