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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdc4cdfec9aeed9723b3516972abf18d8d90c659e8f8d7d88dffb1083dba234f' 
  AND token = 'XTbmGaWcGni0wgIfF76Ojoy2RrdsjMcZd2ekp0NfDjU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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