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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b5738a51838f18e90a6de492f79f8b382e7757633ca6ca64075312f29b28859' 
  AND token = '38ETwJq2em4E8lDpchiAK+tYWMs5ZrEru98LveZkcss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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