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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '383bc8b8a9cdefd43958a03f2f97d0c1dfcea70fbaddb09e3715da83772b1b95' 
  AND token = 'l88DwczD5RttwqER013JVdM0m/5/3qBBs2G0FB0RnQ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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