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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a90c9335743e4f25c283219d3f2d51d50531f784b9f271fb3c94bc75486e96ee' 
  AND token = 'Ocs8bllVmE6jpH0+CiOLMbXI9PRoQvi6pWbTHVbke8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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