SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11f504e58c83ecaf90441acff2d2fb91aa1569784477cde04b07d87d43fbe5f4' 
  AND token = 'wr+KMjqgb4Ola4mm83ZOK+6P7RDlNpw+MTiB8h9lVRs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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