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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '717041ac62152ca3825cb08b046c5d98b81ea503b3d96c33608fb7ec8644e438' 
  AND token = 'T8zmHV8EHd9s8kLCyhk9bTrHXUX8kC+8cBkohXeO9Wo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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