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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d8bb9ea7d683b6c1c03618920633ab9e5cc342082c55b197c56c2884c4acb63' 
  AND token = 'vhrDTu6yHAazFNb0fKkedMGgcOFkLlzFyRyQtJbIhoU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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