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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9c53c6125eb65836aa5336314560eec1fbe2f8f4d7d95cc1cbe9fe512eb6c90' 
  AND token = 'guEvRIe2hFoWDPtvQpe/bE8ajRdA6QO4OH2SSCA45gU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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