Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd332f8af2bbf0150b42ee12160557d01a1cfc66be8ed639192fa4fd24c93475c' 
  AND token = 'fhjKcJ2HI9UGsy4K9TC7xGTrOTwhEY+AhEi7Ryb8BKk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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