SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd3fbb39ce41fcd0fe749c196c582b77a3b3b8ab5ccae6c0156a49103721d959' 
  AND token = 'FZiBtjxSIy8VDvwKa/i3VzXuV+BcRccEQpewbTLgIBo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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