SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9069c6602fc138db717e5394d1d6f17ad84625f82c5dc3a5e164b80f8a69747d' 
  AND token = 'bLVmZSV5XwuHBRUGKUujMbDya/4ppzSapcLWWL8R/GI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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