SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a77654b7c8e239659cf3a145d143f36fe08a17c128c23470d1ca85fbb3151c6' 
  AND token = 'JHWszrkmyKQQA1g/DluxDBQIKrwu79HdK9mWtszt8gw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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