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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b40598419f0fa22b858ffb77549f75f0245d798f83387d86218b409ae01a0dae' 
  AND token = 'EBGEirBOMTT+KLP5bXM2owfpdw7PARx7H9DmNLlwook=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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