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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '920867a716154f23d8a3f6f9d7edf3a70253a8a6635a5810ed58618ae9b9b8fb' 
  AND token = 'iUx+XzSwr4wYAW3Hf9EVn2m9OanShHC6B4yOVZcUXiA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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