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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef8b7f8a622ac1c2c1f26c6fb05b09412a06840e22ee81c1e6622e73d2ebe047' 
  AND token = 'SfrfIw4EhEVKlPO8NF/LnIkeCkH1Zvv/0shwSQ44W8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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