SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11c20fe8b7b367e8b5f6f9e82302e6752168ddfa781e0acf4a939846158125e1' 
  AND token = '+8cvqV6FejqGB9gFp939RROlJphdKXqlMAO1yP//jdA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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