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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8064e372ba01feb5b48159d9ed50444a6b5d50aab7b5e1455da7a4f626ee859' 
  AND token = 'uGgILVYD48o5e9l4bopNdQfe2Fanih/jjnYD9g7OlTs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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