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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf4fc72bbfb367f83922a89a4bdb44fcc3e62c4809dd8959251cfbf893850e30' 
  AND token = '2vG+wLPGTv1cW7gP0Zh7SgMwUkIyIO3KtL6npWDc3mI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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