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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc6c2acd2d4799da06a90f01a4eaa0d66ba8220557c42e44c25a3567ec90d9f7' 
  AND token = '9PpUEQmS0tvgEU4P+LwUu8rR+tzgqH4SxQk0TGiBzuc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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