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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e604350185efe972866959bcf8df16e2d0ed08d52d5bf4bb3a49eef061fd57ce' 
  AND token = 'Vv5Wms7HWYp7IifB4kV8jfVOAsKdilQa57CREmHi+ps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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