SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf91445761f4663378195f20f0ebd581b09a556742bfa5dcb4a6d74ea6d59333' 
  AND token = '1PIDHiZ0lgyaDJVmG3TCw5DZXVlG0lhOEoVgqQCgnwA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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