SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63c6e52abe18bd0c802af7c62f9d8960b113f3153fbfe13c3b14a59b702c2026' 
  AND token = 'AnMwz/xqNwgtBYFcNvsjXCIkdUQbl3vCpHx92JJjW44=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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