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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60da9e484c0679bddfdce41b4d9390e460a1055d32587db4662f864ae2c8b3d3' 
  AND token = '84E9HQ/cw6GSljULv5bZAQsC8sj5phcfsvZiLw2AUIE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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