Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6bb865e99f26c012947272e2ec6c0552a302ea6cb1326ff422dc73e74a7c6fa' 
  AND token = 'Pn2ASM6iok4CiDwOvNlVxcaBzIOWY8wEEHJ/k6kWYrg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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