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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adb742b627c7e8cda513c489f3d3310ceaf7386755630b86db98fc85c90836cc' 
  AND token = 'jra5B1jVX0fSDx3dX/RQfHuCCvtAPbjOItrH7ZdOWbk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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