Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e851736b37b201d453ed2684b8ee103f55255ee0d342de1700f2042d4600f01e' 
  AND token = 'xbzKFq1moFrjONf6xaYp2M+WYmDxRfOdY0HaSifoRSg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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