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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93e3a69a9acb70f603485c06aee6b9fe4725d48a10c13d812bc409c39f525616' 
  AND token = 'NFFtAEV8kEW4hgR0O7Cm63XYBHw5nLjt8wV1oa4YQHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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