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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aabc4d82087a8ae425199625a4398cb7dbbf73f860251b766f4c7d926993b1b4' 
  AND token = 'dtuAhXESta7RffWPShknSJXOBcQu0dxcOLYlNf+jVwg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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