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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aed9e1ce82af085a5bb79558d9bcc0985c02f6714f5f613a5f4683c158eb9b73' 
  AND token = '+qnWosMuGns9Q7bB4YkGI5EwjQoCs9Dq02p8igWtGmc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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