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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ac7a03166e0af927cd774f4afa294017f951ae47564be7c089a1cf23407bd03' 
  AND token = 'mkH+v3rEwU7Z8va9VlficmuBvxPTw0WEBLl449/faa4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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