SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32d62c3c80ac88794ef1b27a19310c03a9f72a7f01b926eec39f388d005a0cc0' 
  AND token = 'XvtihTzx5pvqg8zolmpvNlQqJHo4Bs7Wg5M+z//RMvY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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