SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd9cb7e8cc0d9054723923f6cd45a9ca5818638ea6824312d849470b37ac3be5' 
  AND token = 'yLAgPGMre1zsQ79l1xY9svsuA/hq0iwZWgE+C9DwwpA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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