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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ea1564f87a4c71e664161937915e6122450931ae8ef641f2d854740b6007f4e' 
  AND token = '5Q32l3nxmpZ9BrUDMvTYM6Oss0rIGNkGZBArHoPsDKA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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