SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b226a5a258468b67f7afe1e516f2589d8d79a1250dd2e1bc502973c03419b7f3' 
  AND token = 'pvfbjW9fZXuRddWBG2w1WI/9rpGYKP8FyJ8ADnxLJUs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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