SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6370af4744dbc160687167885fa3b5a27f006eca992ac31a59ab01e89c08893' 
  AND token = 'Z/+vH0n6ehUhOKDB1LKVgUkFzVIKRn0ccr5GeuYszl0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00081

JSON explain

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