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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '650222b5b7b3073b8b9ccd5976b9ca20e40cf16a9d1c08ddcd306222bfaeee7d' 
  AND token = 'j4tN92avb0NqBhRVB5hMNRVRhFsQZVCkkOHX+9zLDmM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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