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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b06fc20e19391956df983241f142389e5e192ca3b726b0ad1cc2a85f9e9af76b' 
  AND token = 'RvNVuKaZU98AErpAei0OZD/0zbI1ES5U6xPj7kOEkno=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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