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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '21ba8d0ebbe9f8c293e53764ce6534e89a9cdc32f74a0d78c119bcea7953d1f7' 
  AND token = 'a92frYcQ2LG391LYoWm/ZtoJwu+MQIh/7jUQ8tg6EZA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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