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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd7b318b05f09565bd92f558be687df2a58f7cdd8a71f4906b23f8996a9aae93' 
  AND token = 'B7bRqIz7A5wxkL5zCxOToytE+AgCSwDg+207mdN0CmU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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