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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92f36878a418588f36a8c33b731d5cc7c31201fb83ee5700d7edd53faa42256e' 
  AND token = 'SyJxGYNH6tOtDkMq4BRPxmr6Oe9P49+7td1uIyeRh7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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