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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2514f43cb4084994fdd028c31d3985b3673fc19f413559f3ec071132dc76af8b' 
  AND token = '+AAZC1oPubx4CDCap+iPgpcBfE/9UfZfDx5Kl7eUyAs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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