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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '991b5c849b6cf0f808fcad639f647d21ef956253d303daed5cca4538bcb6d05d' 
  AND token = '+XXuywloNHyOUwjXcP33lP6OGNHdZ/z+3FaGwvG49nY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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