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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6cea7c09082d92fe91ac02949229ec571b824916280ad47bd80cce672fe877e' 
  AND token = 'ak4AWT8LHojm9PbMw7CbzsDA83aj0K9OBzADG8Kl72U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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