Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a238e3eec7f2352b16ec5e536db49cd2e36078f2e96794cc980111ca487dfdfe' 
  AND token = 'ko1tYmb8JroKHXS71DHsBfVXkwAgzvE1Y9nDckjMSVk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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