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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a63424a70be81cdab22069881fb28c0f3c30acd3771c9fd04ef5961e1a7b1afe' 
  AND token = 'f79BlmFfy5LVTW0ogaxwPKdqwntlG1lkvgG/8myu6Qc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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