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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93603ea104abf6608448cca3edb4d215da5e6744587d846379f89c59c4b05cd7' 
  AND token = 'wtLUidJX66nNJ8h7HNIqkvhEJO8PHNhrFD3C79UCLmU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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