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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68ff81a3d3abf8ae2ac1f41e903550f1bc1efc15a0d2f24cf61b6e5b43ca7423' 
  AND token = 'JXriCZm9eTZ8qqUgzhiwf3GAH5kQQACfAKZVrhq0jI0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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