SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60fc1d58980d4db1c307893e8d3e68bd5cafec637fa1d8722e90ac78b923e33f' 
  AND token = 'LShuBu7EUvBZ1LETXSWdwKMnef3GbDjLBw+m85lSw14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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