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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '239120c4bc1c1eec1d315ca14822f3dc77faf372a4a87979b985d732ba933700' 
  AND token = '3cnqYSEBPBWyq4cd4+zO9aBgNanO6k6Afjiw8Zo2puQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00106

JSON explain

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