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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70a70dc33619bb99ac7625fd75f6da12843db2915706ed1e99b172b491d83e1f' 
  AND token = '5qwmC5g6tUAt2zXtd5QaweJ/1V+YVXVyIDYvuRoQ020=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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