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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '088387198cb4bc674dc65a786337d745d311e864ded5d5255a28817ad164b70b' 
  AND token = 'ex+AjwY8lWpC0uFlAecJIkJDvJ9XuNyArD+tUMbqw+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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