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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b266d2aaa22b5b4b8bbada3f06b3915eb099cf0cccef2db3f07f80bdb94b6c3a' 
  AND token = '9YfMg++xIqeDpKjmI9xsHwsF3LVJSUTd2McfKUw3QdY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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