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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '003d11c328caba7ec16510edcb6ef77a61e8faf9df4875eb8ab3ab019cb3b0ad' 
  AND token = '3iVfESmBSjAMCtJu8YeD7EqZIsoxlhkxBYesA6Ma62E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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