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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6867e3cb29187e2e3493a4833cbb74c712f1e588e372daed6deb38169f47d934' 
  AND token = '3gVdqaWwIlNKAX0YIDnBz8WqaGlMGu4ZqB3PXCWRi7g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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