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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36d2fe206049d31eb1e85d8e5485193ffbe3c2e00ee907b8b0ff4392fcc1ca1e' 
  AND token = 't1TM3worPVkf/5oJA0jL4MEEdDfsTpUiQO4/gnZx4Yc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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