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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23966debd2b39fe700173db5e5ebc109731e84abc868489e6ab8f2cedf630f17' 
  AND token = '7633maC9NaNVjUfKlEQzf+WBVGgGQWVJ8qOlj72py2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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