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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e46ac1d46a157e688f84efc5b11f8dc49c0b370b57693e9bfdcc9de7a4e976ec' 
  AND token = '8FLheeLvgmMOgBbFek6drSMuU57WEHWGRiWEBJaKW5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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