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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a1e6657a866ae050a7ccb842715d03eda6e4c670445cfab15dd23a6add416f6' 
  AND token = '4u0oGgg90akgiZaNTUwnKPeQrTtwv8SUb+fQ5jO/G8Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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