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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bb8e690ab0fe48296f7945d2921da95db0c5087ad87bc25e91e6b7e2c92bffa' 
  AND token = '4CWkCFSz9fLNJIxex1BZOPlIjH8ydEiI6BvRVFDTD5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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