SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37e0952d095743211a47f0d1bd5569546e25072de90187fcd39971ee95d17bf1' 
  AND token = 'Ko9ViHQNqCOheN50m0M8LvwvzRnQw/uGtJYeh2Xlaqg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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