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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '589061123da60e97b8573ddcb50414a243a50550717fa792fd874dc0d0c0bfd6' 
  AND token = 'bX9Ox8o/hP7DPhhJ4r7994yoYbznVFFBeldlT7fbGD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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