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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bb647096085f28aafddf8af88faa1de8165137f1f50acfd865537a02df35798' 
  AND token = 'pl84eLT39U0mfvSDK5kivw6WysjnWBS6rDb+BFS/p7A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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