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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5621c85b83eb134c84e79b8cc06e0b920595b5bbab385ab522b12cd5b9b30ff3' 
  AND token = 'sMMK+9TbW4NvKvdr5hXcjxwm26iLcapHSHa9K7sp7/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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