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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3406a7ab2d58081699ea02e52b395f7416d67710b1309ae3fb682c6f7f9ccd67' 
  AND token = 'acTovhEv4zbcDbvd2nVEq7xkBoR59uXrQ7rtEP+xiNU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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