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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c58598bc80395b702653b9a29fa73b0620f4389703d45ab21e2aae72e5e601b' 
  AND token = 'EhVxHMNNnBYXiCy7xbblAzBDEM1oydNEBd1DlpiXHmI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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