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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb7a2f6cf9b23cd068f197b7efc2cb8ec36735ad7e9d468cb108ce8e788dff78' 
  AND token = 'yH79w8mCSsPoEJoCab3GlB0cMVVpCLuEy1Tdi6WxPd4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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