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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15fa700f9a82447de49e827a6d6cd5a76ab9d9cdc215fd351ccdd4eb39f67973' 
  AND token = 'K76O9TgjA1jsY4FQY2q9IyBtH7oPdd6DxDsx7esyoRI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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