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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d09549411b40a7487e8e7ef188f071a952f06483c87adbdcdbafb46d4c5d58c' 
  AND token = '1ATsf5uhQFf7aEwGT39XVfjePJltHswQJ1UrlXD31lw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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