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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c4c0648373352480842a6f72ca8ee60fab3a94a9681eb8fadb34aee440cff6d' 
  AND token = '+5urv5fzUtm1ibuMQ3RzADY6Rbl2jE4wq6H6YMIf79w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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