SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afc5ce93e99f2cd8f534bb79afcd79de81f6602fd7c9e43611b5379245631d8d' 
  AND token = 'lRxZwbhB80XfmLWxbwjNx+RqfTI4vy241J09/QpTEoQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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