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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0da4e96aebf5da771f78d900d55b0b9fc7e71f590c19afe16d9da614c39d5357' 
  AND token = 'UA7HsZlj9ea9HXDY9DSgEcwW6SL/J1dxDx/YKtrPj8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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